Electric compressor

Abstract

A compressor includes a compressing section accommodated in a hermetic container and a motor section, coupled to the compressing section, for driving the compressing section. The motor section has a bored section on an end of the compressing section side and a motor having two rotor poles and including a rotor core in which permanent magnets are buried. The compressing section includes a bearing made of non-magnetic material and extending inside the bored section. This structure reduces both of loss torque due to magnetic attraction between an inner wall of the bored section and the bearing, and eddy-current-loss in the bearing, so that a highly efficient compressor is obtainable.

What is claimed is:  
     
       1. A compressor comprising: 
       a compressing section accommodated in a hermetic container; and  
       a motor section, coupled to said compressing section, for driving said compressing section, said motor section including:  
       a bored section on an end of the compressing section side;  
       a motor having two pole of a rotor and a rotor core in which a permanent magnet is buried,  
       wherein said compressing section includes a bearing made of non-magnetic material and extending inside the bored section.  
     
     
       2. A compressor comprising: 
       a compressing section accommodated in a hermetic container; and  
       a motor section, coupled to said compressing section, for driving said compressing section, said motor section including:  
       a bored section on an end of the compressing section side;  
       a motor having two pole of a rotor and a rotor core in which a permanent magnet is buried,  
       wherein said compressing section includes a bearing of which part extends inside the bored section, and at least the part is made of non-magnetic material.  
     
     
       3. A compressor comprising: 
       a compressing section accommodated in a hermetic container; and  
       a motor section, coupled to said compressing section, for driving said compressing section, said motor section including:  
       a motor having two pole of a rotor and a rotor core in which a permanent magnet is buried,  
       wherein said compressing section includes a bearing made of iron-system material, and an end face of the rotor core confronts an end face of the bearing via axial space.  
     
     
       4. The compressor as defined in claims  1 ,  2  or  3 , further comprising a plurality of cage-shaped starting conductive bars around an outer rim of the iron core, wherein the rotor has a plurality of permanent magnets buried inside of the conductive bars. 
     
     
       5. The compressor as defined in claims  1 ,  2  or  3 , wherein the permanent magnets are made of rare-earth-magnet. 
     
     
       6. The compressor as defined in  claim 4 , wherein the permanent magnets are made of rare-earth-magnet.